Friday, December 6, 2019

IWISTAO Electronical 2 Way Crossover Preamp HIFI Linkwitz-Riley filter 4...

Crossover PCBA is constituted by renowned Linkwitz-Riley filter. Linkwitz-Riley filter, mainly for the active filter circuit, for example, it is used in many sophisticated multi-way electronic crossover systems. The characteristics of this filter is up to 4 stages attenuation slope, in other words, every one octave frequency sound energy will be attenuated 24dB, i.e. attenuation slope of -24dB / Oct (Oct ie Octave, an octave interval of the mean). Meanwhile, in the entire audio band (20Hz-20kHz), Linkwitz-Riley filter has a very flat phase response, which is far better than Butterworth filter after filter signal, no phase distortion, which is widely admired by audiophiles.

Although many friends put a lot of money and efforts to preamplifier, unfortunately they may experiences a little frustration in final output. It is hardly difficult to solve this problem to use excellent pre-divider circuit of preamplifier plus multiple power amplifiers, our series of electronic crossover board and amplifier board can perfectly realize your dreams!

Sunday, November 24, 2019

Tube Earphone Amplifier 12 ~ 600 ohms Russian 6922H Pre-amp Class A Amp HIFI Constant Current Simple No Casing Audio DIY High Quality


Tube Earphone Amplifier 12 ~ 600 ohms Russian 6922H Pre-amp Class A Amp HIFI Constant Current Simple No Casing Audio DIY High Quality 

It is a high value and cute headphone amplifier hook up to your PC / Mp3 /MP4/ Tablet / any stereo devices. You can have a powerful, dynamic and sweet TUBE SOUND from your headphone! You’ll be astounded at the improvement in sound quality, dynamic range, meticulous transparency, completely demonstrate its high performance and analytical ability, it can also connect with power amplifier such as a high performance pre amplifier to improve your HIFI system.








Thursday, October 10, 2019

IWISTAO 2X300W HIFI Stereo Discrete Component Power Amplifier Finished Board High Power Differential Amplification Input WY2963/WK5688 Output






This is a stereo high-power finished PCBA power amplifier board which is made of discrete components, and its maximum power is up to 300W+300W.


The input stage adopts American power differential transistors and medium power one for differential amplification to make its sound pure and soft. The output stage adopts 6 pairs of US WY2963/WK5688 power pair transistors, and 2 pcs high-precision temperature compensation one with constant current amplification designing, let its sound is more beautiful and delicate and sweet; And, the protection circuit uses imported Omron relay; RC component uses high-precision fever components to ensure the consistency of the materials used in the whole unit.



WHFTA-A686(1)l1
WHFTA-A686(1)lWHFTA-A686(1)l2WHFTA-A686(1)l2



Thursday, September 26, 2019

IWISTAO Finished Tube FM Stereo Tuner Stainless Steel Chassis

WISTAO Finished Tube FM Stereo Tuner Stainless Steel Chassis Black Aluminum Panel HIFI Audio 110V/220V


This unit is a typical superheterodyne radio. It adopts a whole circuit board design that include high frequency receiving, intermediate frequency amplification, limiting, frequency discrimination, stereo decoding, preamplification, etc. The output is stereo signal. It can be connected with various types of tube power amplifiers, active speakers, stereo equalization amplifiers and other equipments.

The specific circuit configuration is as below, high frequency receiving adopts double triode 6N3 for high frequency amplification and mixer amplification, and double triode 6N1 for local oscillation. The IF amplification uses a two-stage pentode 6K4, two-stage limiting, and a pentode 6J4. Phase frequency discrimination, stereo decoding uses TA7343, the decoded audio signal is switched to the double triode 6N2, and then the signal output to preamplification with a 5 times gain.

It is made of stainless steel chassis with black, and the front panel with 8mm thick aluminum plate. On the front panel, there are dual level meters to display audio signal level, and the digital frequency meter display FM reception frequency. Electronic tube with a modern digital frequency meter that is complementing each other with nice, classical and elegant style, maybe the frequency display board of the wireless receiver is the designer's wisdom. The right corner of the unit has a knob to manually tune the radio. All tubes are exposed at the top plate for heat dissipation purpose, and equipped with cat eye indicator behind the front panel. The whole structure of the tuner is compact, components layout had been optimized to be more reasonable.


Tuesday, September 17, 2019

IWISTAO 300B Output Transformer C Type Single-ended British Amorphous 8C Advanced Core Pr 3.5K

300B Output Transformer C Type Single-ended British Amorphous 8C Advanced Core Pr 3.5K Se 0-4-8 ohms



This 300B single-ended output transformer uses British amorphous high-grade C-type iron core that has a unique advantage, especially when he static operating point is 80ma or below , it can give full play to the advantages of the output transformer. After actual measurement and listening, the voice is very vivid, clear, low-frequency tension is very balanced in three bands, excellent permeability and atmosphere feeling

Using high-quality enameled wire, lamination process, CNC drying, vacuum impregnation, well-designed 8C structure, to design to a perfect coefficient.


It is a better choice to tube amplifier audiophiles. Also, there is a matched power transformer.




300B Output Transformer C Type Single-ended Amorphous 8C 3.5K Plus Power Transformer


Here is the 300B tube amplifier.

300B Single-ended Class A 2X8W Tube Amplifier British Amorphous 8C Advanced Core Output Transformer